Deactivation analyses of CeO2/CuO catalysts in the preferential oxidation of carbon monoxide

The surface CuO on the CuO microspheres is reduced into the metallic copper. The particles of metallic copper shed from the surface of the CuO microspheres after reduction. The reduction of the CuO microspheres is carried out from outside to inside. The advantage of inverse CeO2/CuO is that it can maintain certain contact interface between CeO2 and CuO above 155 °C though the CuO is continuously reduced in the hydrogen-rich gasses.